RFR: 1830: Support wildcard branch protection with prbranches [v2]

[Zhao Song]

> In this patch, notifyBot would add wildcard branch protection for the repo, and when the bot tries to delete the pr/* branch, it will temporarily remove wildcard branch protection.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  fix problems

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Changes:
  - all: https://git.openjdk.org/skara/pull/1489/files
  - new: https://git.openjdk.org/skara/pull/1489/files/fefdaac9..b8e97b9a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1489&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1489&range=00-01

  Stats: 23 lines in 3 files changed: 12 ins; 3 del; 8 mod
  Patch: https://git.openjdk.org/skara/pull/1489.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1489/head:pull/1489

PR: https://git.openjdk.org/skara/pull/1489